Los Angeles goes after its second straight MLS title in a rematch with the Houston Dynamo, who lost, 1-0, to the Galaxy last season at Home Depot Center. The field was soaked with rain last year, and it’s likely to be soggy again this weekend.

They’re perfect conditions for the Galaxy’s attempt at replicating last season’s result in a watershed game for their franchise and MLS, which is losing Beckham’s magnetic appeal after a half-decade of impressive league-wide growth.

‘‘I know I’m quite an emotional person,’’ Beckham said. ‘‘I’m just really excited about the game, to be in a third MLS Cup final, especially the second one that’s being played in our own stadium. It’s going to be special . . . I’m happy the team are in the position we are, and the reason we’ve done well this season is because we’re a complete team. We’ve got character.’’

Los Angeles’s late-season run to another championship game has carried a certain sense of destiny for a franchise that’s in for big changes in the offseason. Beckham could be joined in departure by US star Landon Donovan, who’s thinking about walking away from the Galaxy in an apparent mid-career case of burnout.

Even if the Galaxy’s core is breaking up, they’re eager to go out with the franchise’s fourth MLS Cup, tying D.C. United’s league record.

‘‘It’s been quite a ride, and with one more win, it will all be worth it,’’ said LA defender Omar Gonzalez, who also might leave in the offseason. ‘‘We’re similar to last year, but they’re a totally different team. They’re going to be tough.’’

All that uncertainty will be discarded for at least 90 minutes when the eighth-seeded Galaxy host ninth-seeded Houston in an unlikely final between veteran teams that gathered momentum at the perfect time, barreling through the playoffs with style after barely making the postseason.

‘‘We’ve got two good attacking teams, and I expect some goals this year,’’ said LA coach Bruce Arena, who could win his fourth MLS title. ‘‘Last year’s final, poor weather conditions were a factor. This year should make for a more attractive game. Having a rerun of last year is kind of interesting, and certainly they’re going to have a lot of motivation. But so are we.’’

While the world watches Beckham, the Dynamo believe they’re better prepared this year to spring an upset for their first title since 2007. Houston playmaker Brad Davis is healthy after missing the final last year with an injury, and the Dynamo have been every bit as impressive as the Galaxy lately.

‘‘When Houston and LA got into the playoffs, I think a lot of teams weren’t happy about it,’’ said Dynamo coach Dominic Kinnear, who could win his third MLS Cup. ‘‘I think they saw something inside of us that’s going to make us difficult to knock out, and I think they thought the same thing about the Galaxy.’’